I needed to upgrade PHP from version 5.6.38 to version 7.3 by the recommendation from WordPress, so tried to find the way can do that on my CentOS 7.5 server.

Followings are the steps I found

STEP 1.Turn on EPEL repo, enter:

sudo yum -y install epel-release

STEP 2. Turn on Remi repo i.e.remi-php73:

sudo yum-config-manager --enable remi-php72

STEP 3. Refresh repository:

sudo yum update

STEP 4. Install php version 7.2, run:

sudo yum install php